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synthesis and applications of hierarchically porous catalysts

Chinese Journal of Catalysis 2013年第1期34卷 22-47页

作者： Li, Xiaoyun Sun, Minghui Rooke, Joanna Claire Chen, Lihua Su, Bao-Lian State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China 61 rue de Bruxelles B-5000 Namur Belgium Department of Chemistry University of Cambridge Lensfield Road Cambridge CB2 1EW United Kingdom

Hierarchically porous materials that can be used as catalysts or catalyst supports have garnered much attention due to their enhanced mass transport and multiple functionalities. Hierarchically porous catalysts integrate at least two levels of porosity and present the advantages associated with each level of porosity, from selectivity to mass transport. For example, hierarchically porous zeolites offer an effective solution to the mass transport problem associated with conventional zeolites in catalyzed reactions, because they combine the catalytic features of micropores and the improved accessibility and increased molecular transport related to the addition of several porosities within a single body. This review thoroughly summarizes recent developments that have been made in the field of hierarchically porous catalysts, with the main focus on the synthesis strategies that are available as well as their application in catalysis. It is the intent of this work to stimulate intuition into the optimal design of related hierarchically porous catalysts with desired characteristics. © 2013 Dalian Institute of Chemical Physics, the Chinese Academy of Sciences.

关键词： Porosity

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synthesis and Self-Assembly of Core-shell Co@SiO2 Magnetic nanocomposites

Synthesis and Self-Assembly of Core-shell Co@SiO2 Magnetic n...

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International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)

作者： Si-Ming Wu Nan Jiang Wei Geng Ru-Jin Cheng Jie Hu Jie Ying Sheng-Chun He Yong Wang Xiao-Yu Yang State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

In recent years, self-assembly nanoparticles into well-ordered structures possess quite important position in spectroscopy, magnetism, catalysis and biology. Among all of the nanoparticles, magnetic nanoparticles promises an unparalleled opportunity for self-assembly as they can be controlled to form directional arrangements according to the external magnetic fields. Herein we choose Cobalt nanoparticles whose diameter is within 10 nm. In this size they can show fabulous superparamagnetism, which means each nanoparticle is a small domain, when without an external field, the particles are disordered and show paramagnetic. However, when an external field is applied, to which the nanoparticles are controlled to arrange, and at this time they show ferromagnetic. What can’t be ignored is that it is difficult to achieve self-assembly process in smaller size of the nanoparticles due to easy aggregation. Taking this into consideration, core-shell nanostructures provide an effective vehicle to protect magnetic core and enhance their chemical stability. In this work, ordered self- assembly Co@SiO 2 nanocomposites are firstly reported by changing the external magnetic field. Cobalt nanoparticles as the magnetic cores were easily controlled to form varies arrangements, which means they can self- assembly into multi-scale regular patterned structures. Owing to strong external magnetic field, the ordered structured crystalline Co@SiO 2 composite with directional arrangements are successfully achieved by self-assembly. Moreover, by changing the magnetic field, the composite also forms 2D arrays and 3D structures. This nanocomposite can be applied as controlled targeted drug carriers which shows great potential in biological diagnosis and biomedical treatment. It is believed that this methodology of self-assembly can be extended to other similar core-shell nanocomposites with magnetic core and paves way to further applications in magnetism and biomedical researches.

关键词： self-assembly, nanoparticles, core-shell, magnetic.

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synthesis and application of hierarchically porous materials induced by functional proteins in ion screening

Synthesis and application of hierarchically porous materials...

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International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)

作者： Yong Wang Wei Geng Ru-Jin Cheng Nan Jiang Jie Hu Jie Ying Sheng-Chun He Si-Ming Wu Xiao-Yu Yang State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

Biomineralization is a widespread phenomenon in nature leading to the formation of a variety of solid inorganic structures by living organisms. And many chemists have long strived to mimic this nature’s critical tricks. Many studies have been focused on this field. These biomineralized materials are inorganic-organic hybrid composites formed by self-assembled processes under mild conditions, showing interesting properties, controlled hierarchical structures, and special function. Among the biomineralization, proteins are attractive for synthesis of the hybrid materials, due to its much milder reaction conditions, highly specific or multiple functions and many successful examples existing in nature. Here we chose a functional protein, C96 RIDC-1 4 , which has the ability to selectively bind metal irons, such as Zn 2+ . Because of its high surface area, high stability and the property of capillary effect, the hierarchically structured porous materials are one of the ideal materials for biomineralization. In the typical synthesis process of the macro-meso porous materials, the functional protein was used as the second kind of the templates to induce the formation of the hierarchically structured porous materials, besides the surfactant is a template. For the living of the protein, we change the reaction condition to be much milder, such as at or near neutral pH, choosing the special surfactant which is not harmful to the protein, and so on. We prepared the macro-meso porous materials into the monolithic column. And this monolithic column is porous structure with macropores and two sizes of the mesopores. With the obtained monolithic devices, we tested its adsorption amount of Zn 2+ to get the limit value, the efficiency of the adsorption using the Zn 2+ solution with very low concentration and different filter time. Those results show the potential application in purifying the water to obtain the pure water with less impurity ions, purifying the organic compound and dr

关键词： biomineralization, protein, macro-meso porous materials, monolithic column

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Enhanced and suppressed effects of ionic liquid on the photocatalytic activity of TiO2

Enhanced and suppressed effects of ionic liquid on the photo...

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作者： Qi, Lifang Yu, Jiaguo Jaroniec, Mietek State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Luoshi Road 122# Wuhan 430070 China Department of Chemistry and Biochemistry Kent State University Kent OH 44242 United States

The effects of a room temperature ionic liquid, 1-butyl-3-methylimidazolium terafluoroborate ([Bmim]BF4), on the photocatalytic performance of Degussa P25 TiO2 were investigated. Also, the photocatalysis mechanism was systematically analyzed by conducting different reactive radical trapping experiments. The results showed that photogenerated electrons were the main reactive species involved in the photocatalytic degradation of methyl orange (MO), while •OH radicals and photogenerated holes played an important role in the photocatalytic decomposition of rhodamine B (RhB). The addition of ionic liquid (IL) could slightly enhance the photocatalytic degradation rate of MO because adsorption of [Bmim]+ ions on the TiO2 surface not only enhanced traping and transfer of photogenerated electrons, but also facilitated adsorption of negatively charged MO. On the contrary, IL suppressed the degradation rate of RhB because [Bmim]+ on the TiO2 surface not only hindered the access of positively charged RhB to TiO2, but also restricted the diffusion of positively charged holes to the TiO2/solution interface. © 2013 Springer Science+Business Media New York.

关键词： Titanium dioxide

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The study of artificial xenon arc lamp ageing on E-glass/vinyl ester composites

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Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica 2013年第SUPPL.期30卷 33-39页

作者： Ni, Aiqing Zhang, Lifeng Ji, Yundong Wang, Jihui State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China

The effects of artificial xenon arc lamp ageing on E-glass/vinyl ester composite were investigated. The mechanical properties of the composite are investigated by static mechanical tests, the storage and loss moduli, Tg, the peak of tanδ by DMA, the peak location and peak intensity by FTIR for pure resin and the composite, and fracture development and the relationship between fracture density and fatigue stress level by SEM, respectively. It is found out that the most significant ageing factor is ultraviolet radiation, and that the introduction of glass fiber will accelerate the crosslink and degradation of resin.

关键词： Glass fibers

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Preparation of Mesoporous V 2 O 5 @TiO 2 Composites with Enhanced Photoactivity for Gaseous Benzene Degradation

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Physics Procedia 2013年 48卷 38-45页

作者： Chunxia Zhao Subo Feng Wen Chen Xiaoyu Li Yanbao Song Jinqiao Cao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan 430070 P.R.China

Mesoporous V 2 O 5 @TiO 2 composites were fabricated by an ultrasonic method with V 2 O 5 sol as the guest precursor. The prepared materials were characterized by powder X-ray diffraction, field emission-scanning electron microscopy, transmission electron microscope, X-ray photoelectron spectroscopy, UV-Vis spectroscopy and nitrogen sorption analysis. The results indicated that V 2 O 5 nanoparticles dispersed well on/into the porous structure of TiO 2 matrix. The composites presented typical IUPAC IV isotherms with type H 2 hysteresis loops, revealing the mesoporous structure. It was observed that V 2 O 5 loading led to red shift of the absorption edge to 540 nm and reduced the band gap < 3.0 eV. The V 2 O 5 @TiO 2 composites with V/Ti molar ratio of 0.1 exhibited outstanding degradation efficiency of gaseous benzene.

关键词： Mesoporous composites V2O5 TiO2 photoactivity benzene degradation

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synthesis and Application of Hierarchically Porous materials Induced by Functional Proteins in Ion Screening

Synthesis and Application of Hierarchically Porous Materials...

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IUPAC 9th International Conference on Novel materials and their synthesis(NMS-IX) & 23rd International Symposium on Fine Chemistry and Functional Polymers(FCFP-XXIII)(IUPAC第九届新型材料和合成国际会议暨第23届国际精细化工和功能聚合物研讨会)

作者： Yona Wana Wei Geng Ru-Jin Cheng Nan Jiang Jie Hu Jie Ying Sheng-Chun He Si-Ming Wu Xiao-Yu Yan State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Luoshi Road 122 Wuhan 430070 China

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synthesis and Self-Assembly of Core-shell Co@SiO2 Magnetic nanocomposites

Synthesis and Self-Assembly of Core-shell Co@SiO2 Magnetic n...

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International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)(中国国际纳米科学和技术大会)

In recent years, self-assembly nanoparticles into well-ordered structures possess quite important position in spectroscopy, magnetism, catalysis and *** all of the nanoparticles, magnetic nanoparticles promises an unparalleled opportunity for self-assembly as they can be controlled to form directional arrangements according to the external magnetic fields.

关键词： self-assembly nanoparticles core-shell magnetic

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Enhanced photoelectrocatalytic performance of SnO2/TiO 2 rutile composite films

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Journal of materials Chemistry C 2013年第36期1卷 10727-10735页

作者： Yu, Jiaguo Wang, Ying Xiao, Wei State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Environmental Engineering School of Resource and Environmental Sciences Wuhan University Wuhan 430072 China

Ordered rutile TiO2 nanorods grown on transparent electro-conductive F-doped SnO2-coated (FTO) glass substrates were prepared by a simple hydrothermal method using tetrabutyl titanate as the precursor and then calcined at various temperatures. The prepared SnO 2/TiO2 composite film samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The photoelectrocatalytic (PEC) activity was evaluated by PEC degradation of methylene blue (MB) aqueous solutions under UV-LED light irradiation. The results showed that rutile TiO2 nanorods with diameters of ca. 300-700 nm and lengths of ca. 5 μm vertically grew on the FTO substrate. The resulting rutile TiO2 arrays exhibited excellent stability upon annealing in a temperature range of 300-500 °C. The sample calcined at 400 °C exhibited the highest PEC activity due to the combined effects of several factors including its one-dimensional morphology, high crystallinity, close contact between the TiO2 nanorods and SnO2 layers, SnO2/TiO2 n-n heterojunction and the applied external electrostatic field. The proposed enhanced PEC mechanism was further confirmed by the transient photocurrent response and electrochemical impedance spectroscopy (EIS) experiments. © 2013 The Royal Society of Chemistry.

关键词： Titanium dioxide

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Multimodal zeolite catalysts with hierarchically micro-meso-macroporous structure

Multimodal zeolite catalysts with hierarchically micro-meso-...

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1st Euro-Asia Zeolite Conference

作者： Li-Hua Chen Xiao-Yun Li Xiao-Yu Yang Bao-Lian Su State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyLuoshi Road 122 Laboratory of Inorganic Materials Chemistry(CMI) University of Namur(FUNDP)61rue de BruxellesB-5000 NamurBelgium.

Crystalline microporous zeolites with pore sizes typically at 0.4-1.5 nra are one of the most useful catalysts in industrial processes such as oil refining and organic synthesis owing to their strong catalytic performance,high thermal and hydrothermal stabilities,and well-defined micropores with excellent shape-selectivity in ***,one disadvantage of these zeolitic catalysts is that their pores are too small to be accessed by bulky reactants hindering their use in the fine chemical and petroleum processing industries. To overcome

关键词： Multimodal zeolite catalysts with hierarchically micro-meso-macroporous structure

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